| 摘要 |
<p>Flat electric heating elements obtained by applying a filiform electrically conducting layer (9) on a porous insulating support sheet (4), by covering said conducting layer (9) and its support (8) with one or a plurality of porous insulating covering sheets (10) of the same nature as the support sheet, by making integral the assembly by means of a binder or an impregnating agent, and by hardening the resulting assembly under press by the setting of the binder or by the polymerization of the impregnating agent.</p> |
